Data transferring system and electronic apparatus

Abstract

A data transferring system, in which processes to match settings between devices mutually communicating are simplified, software for the processes is also simplified, and the amount of data to be processed is reduced, is disclosed. In a data transferring system of the PCI Express standard, when settings between facing ports of a switch and an end point are changed, a setting change is transmitted to the port of the end point being one of the facing ports by a configuration request. The port of the end point transmits the setting change to the port of the switch by a message request and the port of the switch executes the setting change. The port of the switch sends a completion message signifying the setting change completion to the port of the end point by a message request. The port of the end point executes the setting change.

1 . A data transferring system, in which a data transferring route has a tree structure and a connection between nodes on the tree structure is point to point and communications between facing nodes are executed by matching settings between facing ports of the facing nodes, comprising: 
 a first notifying unit that notifies one of the facing ports of a setting change when settings between the facing ports are to be changed;    a second notifying unit that is a port having received the notification of the setting change and notifies the other port of the setting change;    a first setting change unit that is the other port having received the notification of the setting change and executes the setting change; and    a second setting change unit that is the port having received the execution of the setting change from the other port and executes the setting change.    
   
   
       2 . The data transferring system as claimed in  claim 1 , wherein: 
 the second notifying unit executes the notification of the setting change by using a packet whose format is different from a packet that is used in a case where the setting change between the facing ports is executed by notifying both the facing ports of the setting change.    
   
   
       3 . The data transferring system as claimed in  claim 1 , wherein: 
 the second notifying unit executes the notification of the setting change by using a packet which is valid in a connection between the facing two ports and is invalid in a connection between other facing ports.    
   
   
       4 . The data transferring system as claimed in  claim 1 , wherein: 
 the data transferring system is based on the PCI Express standard.    
   
   
       5 . The data transferring system as claimed in  claim 4 , wherein: 
 the facing nodes are a switch and an end point.    
   
   
       6 . The data transferring system as claimed in  claim 4 , wherein: 
 the first notifying unit is a CPU of a root complex.    
   
   
       7 . The data transferring system as claimed in  claim 4 , wherein: 
 the first notifying unit executes the notification of the setting change by a configuration request and the second notifying unit executes the notification of the setting change a message request.    
   
   
       8 . The data transferring system as claimed in  claim 7 , wherein: 
 the second notifying unit sends the message request by the routing standard of a local link.    
   
   
       9 . The data transferring system as claimed in  claim 6 , wherein: 
 the port having the second notifying unit and the second setting change unit provides a third notifying unit that notifies the CPU of the root complex of that the second notifying unit executes the notification of the setting change by the message request; and    the port having the second notifying unit and the first setting change unit provides a fourth notifying unit that notifies the CPU of the root complex of that the second notifying unit executes the notification of the setting change by the message request.    
   
   
       10 . An electronic apparatus providing a data transferring system as claimed in  claim 1.